quote:

Originally posted by RIP:
Sir Stradling, Knight of Realm Four-Five-Eight:

The .38-55 WCF and .360 NITRO EXPRESS 2-1/4" have CIP Pmax of 35,000 and 36,000 piezo PSI.
They both have a case capacity of about 52 grains H2O if the defaults in QuickLOAD are correct.

Starting loads for the .38-55 might be as hot for the .360 2-1/4" BPE. as you want to go.

AA-5744 half-case full and a light bullet like you are using (150-grainer) does indeed sound like a great place to start, and maybe end.

Matching a grease-grooved or powder-coat-painted cast lead bullet to groove diameter +0.001 is a good idea, as is the chamber cast.

Have you considered paper-patching a soft lead, smooth sided, cup-based bullet?
For the smokeless AA-5744 you want a bullet that is 0.001" larger than bore diameter, and patch it up to groove diameter or thereabouts.
It sounds like the bullet you are using is only about 0.001" bigger than your bore diameter.

Look around at Buffalo Arms Co. to see if they have anything that might help.
I just got my Care Package from them today.
I bought some .451"-diameter, 530-grain pure lead bullets from them to try in the .458 WIN and its twin brother, the .45-100 SWT.
I expect to patch it to .459" or larger.

Anyhow, if you want a QuickLOAD simulation for AA-5744 by my old version which I think is still good for AA-5744:

1. I would recommend keeping it down to 28,000 PSI.

2. Measure your chosen case capacity, in grains of H20, gross fill.

3. Measure the length of the bullet, length of case, and COL with bullet seated where you want it.

4. Assuming bullet weight of 150 grains and flat based, right?

5. Assuming default groove diameter of .365" in QuickLOAD to use their bore area.
I noticed they defaulted to a .363" bullet diameter, .002" smaller than groove!

Let me know if you want me to screw around with that simulation.
I will copy this to THE MISSION thread, to ring the MISSION BELL, of course.

Rip ...

quote:

Originally posted by 458PHCAPSTICK:
Rip have you ever heard of the rare".458-400 Express revolver round made by Mr. John Gallagher to duplicate the 475 Linebaugh useing shortend 45-70 cases and .458 400 grain bullets?

quote:

Originally posted by bcelliott:
I've often wondered why someone didn't shorten the .458 Win Mag case to 1.4" (similar to the military 1.5" version that RIP referenced above) and eliminate the taper for a .475 revolver cartridge. It seems to me that this would have worked better for use in narrower cylinder revolvers since the original .475 Linebaugh from .45-70 brass had such a large rim. Today, of course, the .475 Linebaugh rim is .540" vs the original .608", but the belted case was already .534".

quote:

Originally posted by jwp475:
If it is shooting a 458 bullet then it is not duplicating the 475L

quote:

Originally posted by bcelliott:
I've often wondered why someone didn't shorten the .458 Win Mag case to 1.4" (similar to the military 1.5" version that RIP referenced above) and eliminate the taper for a .475 revolver cartridge. It seems to me that this would have worked better for use in narrower cylinder revolvers since the original .475 Linebaugh from .45-70 brass had such a large rim. Today, of course, the .475 Linebaugh rim is .540" vs the original .608", but the belted case was already .534".

quote:

Originally posted by RIP:

quote:

Originally posted by bcelliott:
I've often wondered why someone didn't shorten the .458 Win Mag case to 1.4" (similar to the military 1.5" version that RIP referenced above) and eliminate the taper for a .475 revolver cartridge. It seems to me that this would have worked better for use in narrower cylinder revolvers since the original .475 Linebaugh from .45-70 brass had such a large rim. Today, of course, the .475 Linebaugh rim is .540" vs the original .608", but the belted case was already .534".

As jpw475 said, the .458 Belted handgun has been done.
I have a Ross Seyfried article from G&A circa 1996 about the .458 WIN 1.4" and 1.6" used in a single-action revolver, probably by John Linebaugh as he said.
I feel an excerpt for "magazine review" purposes coming up.

Your .475/.458 Winchester Magnum 1.4" (why not all the way to 1.6") in a handgun is indeed a HOT-DAMN! idea.
The 1.6" might beat a .475 Linebaugh.

Rip ...

quote:

Originally posted by boom stick:
A fun thought... A 470 Capstick short? What? Yes. A 470 Capstick short. Cut 470 Capstick brass to 1.4", neck ream and stuff a 475 pistol bullet on the top. Like the 458 Devestator below.

http://www.singleactions.com/458Devastator.html

The 470 Capstick 1.4" (or other lengths) could clean up a 480 Ruger or Linebaugh chamber, use the same 475 barrel and on a Ruger single shot especially go higher pressure, say 60k psi? More boom, stronger brass and you probably have a bunch of used split neck brass just laying around. Maybe call it 480 Jolly Roger but 480 Roger for short. Just change the gun stamp from a u to an o on a 480 Ruger to make the 480 Roger. 480 JR!